Pneumatically propelled duct motor

Details Pneumatically propelled duct motor Pneumatically propelled duct motor

1980-08-20

1983-09-13

Reeves, Robert B.

Railways

Tubular way

Internal service device

91217, 92 90, B61B 1310, F01B 1502, F01B 1904

Patent

active

044035519

ABSTRACT:
A duct motor for carrying drawing ropes and the like through cable ducts consists of two inflatable gripper bags and a telescopic section. The duct motor is driven by compressed air, and operates by one gripper bag inflating, telescopic section extending, the other gripper bag inflating and the one gripper bag deflating, telescopic section contracting and the cycle being repeated. Compressed air is distributed within the duct motor by a distribution valve and a pair of inflation and deflation valves associated with each gripper bag. One distribution valve is not located between the gripper bags and this valve has a valve stem which is hollow, and is used for conveying compressed air from an input orifice to the remote end of the duct motor i.e. the other gripper bag.

REFERENCES:
patent: 2518330 (1950-08-01), Jasper et al.
patent: 2806534 (1957-09-01), Potts
patent: 3263573 (1966-08-01), Fogelstrom et al.

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